Balanced valve.



Patented May 27, |902.

E. B. SINTZENICH.

BALANGED VALVE.

(Application filed July 2B, 1900.)

(No Model.)

Uivrrnn Srnrns .WENT OFFICE.

EDVIN B'. SINTZENICH, OF ROCHESTER, NEV YORK.

BALANCED VALVE.

SPECIFICATION forming part of Letters Application filed July 28, 1900.

To all whom. t may concern.-

Be it known that I, EDWIN B. SINTZENICH, a citizen of the United States,and a resident of Rochester, in the county of Monroe and State of NewYork, have invented certain new and useful Improvements in BalancedValves, of which the following is a specification.

The invention relates to balanced valves for steam-engines, pumps,air-motors, &c. Its object is to produce a means of balancing aslide-valve by means that are easily attached to it and to provide meansfor packing the balancing mechanism or to prevent the escape of steamtherefrom.

The invention consists in the mechanism hereinafter described andclaimed.

In the drawings, Figure l is a vertical longitudina lsection through theports and steampassages of a cylinder and through a slidevalve havingone or more balancing devices attached thereto. Fig. 2 is a top planview of one-half of a modified form of one of my balancing devices, andFig. 3 is a vertical cross-section on the diameter of the mechanismshown in Fig. 2.

The mechanism herein shown will be described as applied to the slide orD valve of an ordinary steam-engine cylinder, although the device iscapable of application to other constructions by means within the skilland knowledge of those acquainted with the art of motors and pumps ofvarious kinds.

In Fig. l is a portion of the cylinder of an ordinary steam-engine. o.is the exhaust-port thereof. a a2 are the steam-ports. B B are the sidewalls of a steam-chest. B is the steam-chest cover. h is the valve-rod.C is the slide-valve, which may be of usual form, or, as shown in thedrawings, it may have extended iianges c c on the ends, perforated at cc', with ports adapted to register at the ends of the stroke of thevalve with the steam-ports C1. 0.2. The lengthening of the D-valve C, asjust described, is for the purpose o f giving a firmer base on which thevalve rests and to tend to prevent a lifting or tipping of the Valve.The side walls B B of the valve-chest are or may be higher than usual inorder to accommodate the balancing mechanism now to be described. On thetop of the D-valve C is fastened a box E, that is connected with theinterior cavity of the valve C by a proper Patent'NoL 700,985, dated May27, 1902.

Serial No. 25,127. (No model.)

passage. In the present instance this passage is a small bore e througha bolt E, that fastens the box E to the valve-seat. If now the pressurewithin the box E is the same as within the valve C, the valve C wouldbecome balanced and there would be no tendency of thevalveto rise fromits seat, nor would there be any pressure of the valve C downward on itsseat except the mere weight of the valve. This will be the case if thebox E is made steam-tight and the pressure in the steam-chest isexcluded therefrom. The top B of the valve-chest is used as Ithestationary surface just mentioned, and I produce a steam-tightconnection as between the box E and the lsteam-chest cover B by thefollowing means: The box E is made cylindrical on the outer side oftheftlange e, and around this cylindrical surface is placed apackingring f, that is capable of movement up and down around the flangee. The inside face of the steam-chest cover and the upper edge of thering f are surfaced to fit closely, and the said ring is lifted by meansof a spring f pressing against the iiange e0 on the box E or, ifdesired, pressing upon the top of the valve C, which raises the ring finto ycontact with the under surface of the valve-chest cover B. Theringfis split in order to expand and contract and to tit upon the outersurface of the flange e. VOn the inner sur` face of the ring is cut agroove fo, which ends at points adjacent to where the ring is split, sothat the groove fonwhen the ring f is tted upon the flange e constitutesa steam-tight cavity. On the lower edge ot' the ringfis cut anothergroove fo', that, like the groovefo, ends adjacent to the point wherethe ring is split and forms another steam-tight cavity. These twogrooves fo and fo/ are connected by one or more passages foi. Beneaththe ring f is a base for supporting the packing, consisting in thepresent instance of a second ring f2, that fits against the lowersurface thereof and which the spring f presses against the lower edge ofthe ring j". On the outside of the ring f is another thin ring f3, thatis also split and is so set on the ring fthat the split of thelast-mentioned ring is covered by the ring f3. Of course the steam isled into the steamchest and pressure therein is the boiler-pressure.Under this pressure steam passes into IOO the cylinder through the portc' and the passagey a in the vposition of the parts shown in Fig. l toone end of the cylinder. From the other end of the cylinder steam passesout throughthe passage a2, valve C, and exhaustpassage a in this sameposition offparts. If the area within the packing-ringfis equal to thearea of the open ports under the central cavity of the valve C, therewould be perfect 'Inasmuch as the pressure in the valve-chest is greaterthan that under the valve C or inside the balancing device, thispressure Will tend to lift the'ringfzagainst the lower edge ofA theringfand by reason of the groove f and passage]E02 will cause `theringfz to hug the bottom of the ringf very closely. So,

also, the pressure upon the split ringf3 will cause it to fit closelyupon the fiange e. This operation is arrested in the case of the ringsf2 and f3 by the grooves fo' and fo, which act as if they Were openports under (as to the pressure) the ringf2 and the ring f, wherebythere is a greater surface for the action of the outside steam-.pressurethan there is on the inside of said rings, the same being diminished tothe extent of the area of the groovesfo'andfo. The action of thesegrooves thus described becomes eective by reason of'passages e0 throughthe fiange e, which connect the interior of the balancing device withboth grooves fo and fo, being connected with the first through thepassage or passages fm. It will be noticed that the inner upper edge ofthe ring ff is recessed or grooved, as atfo, the purpose of this beingto cause it to tend to hug the steam-chest cover B more vclosely onaccount of the increased surface for operation of the outsidesteam-pressure over'the surface of the ring f, which takes the pressureagainst the steam-chest cover. Thismechanism is found to be effectiveand tof remain steam-tight, and by reason of the higher pressure in thesteam-chest outside ofthe valve C and the balancing devices over thepressure within the balancing device and inside the valve C the pressureof the valve upon its seat is reduced and said pressure is variable inaccord with the pressure of the exhaust inside the valve C, whichpressure of the exhaust is increased or reduced inside.

the balancing device by reason of the communicating passage e.

In Figs. 2 and 3 there is shown a modified form of the same mechanism inwhich the ring f is surrounded by another split ring g, outside of whichis placed the ring f3. The

ring Gfhas a groove Q0 around its lower edge corresponding to thegroovefo. One or more passages Q02 connect the groove go With a grooveQ03 on the upper edge of the ring g, and

Aone or more passages g04 connect with a passageor passages fo* in theringf. This pastight it of the movable ringsfand g against thesteam-chest cover; but upon employing the grooves and relief-'passagesleading from -them the steam-tight fit of the rings on the box E andupon the steam-chest cover is found to be perfect and to have movementto produce a tight fit and the exclusion of the steam in a way whichdoes not occur Without them.

The out-side ring]3 may have, as shown in Fig. 2, a protecting-plate fw,that is fastened in any suitable manner, as by a screw 731, to one endof the ring near Where it is split, said plate passing over the splitand being held against the opening at the split by the steam-pressure inthe steam-chest.

In the top B of the steam-chest is a hole b', filled by a movable plug510. When this plug is removed, the pressure in the interior of thebalancing device is always the same as the atmosphere and avoids, amongother things, the disturbing effect of back pressure from thecylinderinto the D-valve. With this construction the bore c may beclosed by a plug elo, or the bolt E may be made solid. When the usualform of riding cut-o is employed, the balancing device usuallyy has nouidpressure connection with the D-valve, but is merely fastened thereon,and the hole b is left open.

The box E rests, as shown, on the back of the D-valve (l, and so much ofthe box as rests in contact therewith of course precludes steam-pressureon so much of the valve. I prefer to leave some space between the bottomof the box E and the back of the valve in order that the steam-pressurein the steamchest, which of course acts in all directions, may get underthe box and exert a lifting action which relieves the pressure of thevalve C against its seat. The area of surface of the under side of thebox E thus exposed to the steam-pressure should be greater than thesurface of the open ports under the valve C.

It will be seen that this balancing device may be applied to any of theusual forms of slide-valve without change, except that in some cases thesteam-chest has to be increased in height and the under side of thesteamchest cover must be surfaced.

What I claim is-'- l. In abalanced Valve, a cylinder havin gin- IOO IIO

let and exhaust ports,a slide-valve forcausing inlet and exhaust ofsteam to the ends of the cylinder, a stearnfchest, a box secured to theback of slide-valve and a movable metallic packing supported on a baseon said box and fitting the exterior of said box and against thesteam-chest cover and having one or more grooves on its surfaces incontact with said box and said base and open passages from said groovesto the interior only of said box, substantially as described.

2. In abalanced valve, a cylinder having inlet and exhaust ports,aslide-valve for causing inlet and exhaust of steam to the ends of thecylinder, a steam-chest, a box secured to the back of the slide-valve,and a movable inetallic packing supported in a base on said box andfitting the exterior of said box and against the steam-chest cover andhaving one or more grooves on its surfaces in contact with said box,said base and said steam-chest cover, and open passages from said grooveto the interior only of said box, substantially as described.

3. In a balanced valve, a cylinder having inlet and exhaust ports,aslide-valve for causing inlet and exhaust of steam to the ends of thecylinder, a steam-chest, a box secured to the back of lthe slide-valve,and a movable me- Tallic packing supported on a base on said box andiitting steam-tight against the outer surfaces of the box and againstthe under surface of the steam-chest cover and upon said base, means forpressing said base upward against the steam-chest cover, said packinghaving grooves on the surfaces pressing against said box and said base,and open connections from said grooves to the interior only of the box,substantially as described.

4. In a balanced valve, a cylinder having inlet and exhaust ports,aslide-valve for causing inlet and exhaust of steam to the ends of thecylinder, a steam-chest, a box secured to the back of the slide-valve,and a movable metallic packing supported on a base on said box andfitting steam-tight against the outer surface of the box and against theunder surface of the steam-chest cover and upon said base, means forpressing said. base upward against the steam-chest cover, said packinghaving grooves on the surfaces pressing against the steam-chest cover,said box and said base, and open connections from said grooves to theinterior only of the box, substantially as described.

EDWIN B. SINTZENICII.

Witnesses:

C. M. PERKINS, F. BISSELL.

